Concrete Slab Cost in Seattle, WA
In Seattle, WA, concrete slab costs about $3,750 for a 400 sq ft slab, with most jobs from $1,880 to $8,130. That is 25% above the national typical price of $3,000.
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Concrete Slab price range in Seattle
| Low | Typical | High | |
|---|---|---|---|
| Price in Seattle | $1,880 | $3,750 | $8,130 |
| US national price | $1,500 | $3,000 | $6,500 |
| Difference | +$380 | +$750 | +$1,630 |
Labor is usually the biggest part of the bill, and rates in Seattle depend on local demand. Local cost index used: 1.25 (1.00 is the US average).
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What affects the price in Seattle
- House or job size
- Material and quality grade
- Local labor rates
- Permits and inspections
The price covers a 400 sq ft slab. Typical project time is 1 to 3 days plus curing. Expected life: 25 to 30 years.
How to get a fair price in Seattle
- Collect at least three written quotes from licensed and insured Washington contractors.
- Ask for the price split into labor, materials and permits.
- Check licenses with the Washington state licensing board.
- Pay in stages tied to finished work, not all up front.
Frequently asked questions
How much does concrete slab cost in Seattle?
About $3,750, with a typical range of $1,880 to $8,130 for a 400 sq ft slab.
Is concrete slab more expensive in Seattle than average?
It is 25% above the national typical price.
Does the price include permits?
Sometimes. Ask your contractor whether permits, disposal and cleanup are in the quote.
Sources and method
- Bureau of Economic Analysis: regional price parities
- U.S. Bureau of Labor Statistics: Occupational Outlook Handbook
- Prices are modelled estimates, not quotes
Page last updated November 2026. See our editorial policy and disclaimer.